Process of rendering exposed structures impervious against various agents.



UNITED STATESv PATENT @FFIGE.

MAXIMILIAN TOCH, OF NEIV YORK, N. Y.

PROCESS OF RENDERING EXPOSED STRUCTURES IMPERVIOUS AGAINST VARIOUS'AGENTS.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed.March 17, 1905. erial No. 250,567.

To all whom, it may concern:

Be it known that Lh/IAXIMILIAN TooH, a citizen of the United States, and a resident of New York city, borough of Manhattan, State of New York, have invented certain new and useful improvements in rendering underground and exposed structures impervious to the influences of agents which affect their stability and interfere with their usefulness, of which the following is a specification.

Such structures are walls of cellars, vaults, walls of galleries, and conduits for waterpipes, gas-pipes, electrical cables, and especially walls for underground railroads and tunnels. These walls, especially in streets of modern cities, are exposed to the influence of' agents, such as water, which is present everywhere, in the soil, rock, &c., water impregnated with benzol and other hydrocarbons originating from gas for illuminating and power purposes, machinery-oil, grease used in working surface railroads, &c., and of gases and fumes contained and originating from the grease, machinery-oil, and benzolwater which permeate the earth, rock, and air surrounding the walls.

Hitherto attention has only been paid to rendering structures of the above description impervious to water, and I am the first one to describe a process by which these structures are rendered proof against the various agents mentioned above.

My invention consists of impregnating sheets of materialssuch as paper, cotton, linen,wool, asbestos, &c.first with a pyroxylin solution or a plastic acetyl-cellulose solution to which shellac or equivalent gums may be added and then coating one side with a partially-oxidized mixture of China wood-oil and linseed-oil dissolved in an organic solvent,such as benzol, with or without the addition of pigments, such as carbon-black, &c. Material treated in this manner is impervious to Water, benzol-water, grease, machinery-oil, fumes, and gases, as described above, and is then applied to the structure to be rendered impervious against the above-mentioned agents.

To carry out my invention, I proceed as follows: Cloth or sail-duck is impregnated with a thin solution of pyroxylin and shellac in wood-alcohol to which acetate of amyl and amylic alcohol is added. The consistency of this solution may be varied according to the thickness of the coating which is desired. Usually the commercial pyroXylin-varnish diluted with twice its volume of an organic solvent, as above, is employed. The thus impregnated sheet is allowed to dry, and then the one side of the sheet is coated in the usual manner with a solution in benzol of partiallyoxidized China wood-oil and linseed-oil. Ordinarily equal parts of China Wood-oil and linseed-oil are employed, and the consistency of the solution again depends on the thickness of the coating which is desired. From two to four coats of this mixture are applied. The mixture employed for one or more of these coatings may contain pigments, such as carbon-black and ferric oxid, and I usually add to the mixture for the third or fourth coat some carbon-black. The sheets thus prepared are fastened to the structures which it is intended to render impervious against water, benzol-water, grease, machinery-oil, fumes, and gases, as follows: The wall is first coated with a sticky material like marine cement or a mixture of tar and pitch. The sheet is then nailed to the top of the wall or surface and rubbed or squeezed against the sticky material, and, finally, a coat of the sticky material is applied over the sheet thus fastened to the wa Although I have above described an example by which the materials to be employed for rendering structures impervious against water, benZol-water, grease, machinery-oil, fumes, and gases may be obtained, I do not wish to be understood as excluding from my claim equivalents for the ingredients or the operations employed in the process. It is possible that substitutes may be employed without departing from the scope of the process intended to be secured hereby.

Having now described my invention and in what manner the same is to be performed, what I claim as new, and desire to secure by Letters Patent, is

The process of rendering structures impervious against the influences of water, benzolwater, grease, machinery-oil,fumes and gases, by applying to them sheets one side of which has been treated with several coats of a plastic cellulose compound such as pyroxylin disblack, may be added, substantially as desolved in an orgmhc solvent, to whlch gums SCI'llJGCl herem.

such as shellac, may be added, and the other r r l i side of which has been repeatedly coated with MALI MILIAN EOLH' 5 a solution of a partially-oxidized mixture of \Vitnesses:

Chum Wood-oil and lmsced-01l in an ol'gzmlc HARRY E. BAEH, solvent, to whlch plgments such as czu'bon- FRANK T0011. 

